In the Marshall Islands. Here's the money quote from the abstract of a paper on the continued "unsafety" of living on the former nuclear test site:

Measurable excess radiation could be expected from the decay of 137Cs produced by the US nuclear testing program there from 1946 to 1958. These recordings are of relevance to safety of human habitation and resettlement... and relatively high gamma radiation on the island of Bikini (mean = 184 mrem/y = 1.84 mSv/y)... the standard agreed upon by the United States and the Republic of the Marshall Islands (RMI) governments (100 mrem/y = 1 mSv/y). External gamma radiation levels on Bikini Island significantly exceed this standard